/Engine/Source/Runtime/ApplicationCore/Public/GenericPlatform/Accessibility/GenericAccessibleInterfaces.h
Request a string to be announced to the user. Note: Currently only supported on Win10, Mac, iOS. If requests are made too close together, earlier announcement requests will get stomped by later announcements on certain platforms.
virtual void MakeAccessibleAnnouncement ( const [FString](API\Runtime\Core\Containers\FString) & AnnouncementString )